Reaper fort bug

I haven't reported this as haven't figured out if there's a consistent cause so thought id check here. Anyone else notice some cannon fire being blocked by your ship and you see the hue of the ghost ship being hit (when there isn't one there). A bit like how throwing water can block cannons, at certain angles of the cannon you get this invisible barrier.
I've only had it a couple times and seen other ships getting blocked by it.